LM313H Equivalent & Substitute Parts

Part Overview

The LM313H is a shunt voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 1.22V output with ±5% tolerance. This component operates as a precision voltage reference in power management applications, delivering 20 mA output current in a TO-46-2 metal can package. The LM313H is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

LM313H

Texas InstrumentsIn Stock: 2079LM313H Datasheet

Current PartRFQ

AD589JH

Analog Devices Inc.In Stock: 7758AD589JH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM313H is determined by the following critical parameters:

• Reference Type: Both main and substitute parts must function as shunt voltage references
• Output Type: Fixed voltage output is required
• Voltage Output Range: The substitute must provide output voltage within acceptable circuit tolerance (1.22V nominal)
• Current Capability: Output current and cathode current specifications must support the application requirements
• Noise Performance: 10Hz to 10kHz noise specification must meet or exceed 5µVrms
• Operating Temperature Range: 0°C ~ 70°C minimum coverage required
• Package Compatibility: Through-hole metal can packages are interchangeable if pin configurations align

The AD589JH qualifies as a substitute based on matching reference type, output type, voltage output proximity, noise performance, temperature range, and through-hole metal can packaging.

Parameter Comparison

Engineering Selection Recommendations

The AD589JH serves as an active substitute for the obsolete LM313H based on the following factors:

Product Status: The LM313H is obsolete, while the AD589JH is active and currently in production. This ensures long-term availability and supply chain continuity.

Compliance: The AD589JH achieves ROHS3 compliance, whereas the LM313H is RoHS non-compliant. Selection of the AD589JH aligns with modern environmental and regulatory requirements.

Functional Equivalence: Both devices operate as fixed shunt voltage references with identical noise performance (5µVrms, 10Hz to 10kHz) and matching operating temperature ranges (0°C ~ 70°C).

Output Voltage: The AD589JH output of 1.235V differs from the LM313H nominal 1.22V by approximately 1.2%, which falls within typical circuit tolerance margins for voltage reference applications.

Current Specifications: The AD589JH output current (5 mA) is lower than the LM313H (20 mA), and cathode current is reduced (50 µA vs. 500 µA). Circuit design must accommodate these reduced current capabilities.

Package Consideration: Both devices use through-hole metal can packages (TO-46-2 and TO-51-2). Physical pin configuration must be verified for direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can the AD589JH directly replace the LM313H in existing designs?

A: Direct substitution requires verification of pin configuration compatibility between TO-46-2 and TO-51-2 packages. Output voltage difference (1.235V vs. 1.22V) and reduced current ratings (5 mA vs. 20 mA) must be evaluated against circuit requirements.

Q: What are the key differences between these two shunt voltage references?

A: The primary differences are output current capability (AD589JH provides 5 mA versus LM313H's 20 mA), cathode current (50 µA versus 500 µA), output voltage (1.235V versus 1.22V), and product status (AD589JH is active; LM313H is obsolete). Both maintain identical noise performance and operating temperature range.

Q: Does the AD589JH meet modern compliance requirements?

A: Yes. The AD589JH is ROHS3 compliant, whereas the LM313H is RoHS non-compliant. This makes the AD589JH suitable for applications requiring environmental compliance certification.

Q: How does the tolerance specification differ between these parts?

A: The LM313H specifies ±5% tolerance, while the AD589JH specifies asymmetrical tolerance of -2.83%, +1.22%. The AD589JH tolerance range is tighter on the positive side, which may provide improved voltage stability in certain applications.

Q: What is the significance of the temperature coefficient specification?

A: The AD589JH includes a temperature coefficient specification of 100ppm/°C, indicating voltage drift with temperature changes. The LM313H does not provide this specification. This parameter is critical for applications requiring stable voltage reference performance across the full operating temperature range.

Q: Are there any package-related considerations for substitution?

A: Yes. The LM313H uses TO-46-2 packaging while the AD589JH uses TO-51-2 packaging. Both are through-hole metal can devices, but physical dimensions and pin layouts differ. PCB footprint and component placement must be verified before substitution.